<!-- typeMismatchDueToProjections1 -->
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Type mismatch.
<table>
<tr>
  <td>Required:</td>
  <td>Collection<`Nothing></td>
</tr>
<tr>
  <td>Found:</td>
  <td>MutableCollection<`CharSequence></td>
</tr>
</table>
<br />
Projected type MutableCollection<`out CharSequence> restricts use of <br />
<b>public</b> <b>abstract</b> <b>fun</b> addAll(elements: Collection<`E>): Boolean <i>defined in</i> kotlin.collections.MutableCollection
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